EIP-2315 Simple Subroutines for the EVM

EIPs EIPs core
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Furthermore there is a discussion about gas costs here: https://github.com/ethereum/EIPs/pull/2669#discussion_r430053819

To briefly summarise:

  1. Current costs are defined as "BEGINSUB be base (2) , JUMPSUB be mid (8) , and RETURNSUB be verylow (3)"

  2. @holiman suggests: "I don’t see why RETURNSUB should be so cheap. I’d actually prefer it to be same as JUMPSUB – or, more specifically, that cost of(JUMPSUB+RETURNSUB) == cost of (JUMP + JUMP) . Which currently would put it at mid == 8"

  3. I suggest that since JUMPSUB and RETURNSUB both need to push to/pop from the return_stack, they should be more expensive than JUMP (mid). Maybe the difference is not measurable too much, but still they should not be the same. I suggest mid + 1 or mid + 2 as a hunch.